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Title: Measurement of baryon acoustic oscillation correlations at z=2.3 with SDSS DR12 Lya-Forests [Measurements of BAO correlations at z = 2.3 with SDSS DR12 Lyα-Forests]

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [3];  [4];  [5];  [4];  [5];  [6];  [7];  [8];  [9];  [4];  [9];  [10];  [10];  [1];  [1];  [11];  [12];  [13] more »;  [4];  [5];  [13];  [14];  [15];  [16];  [17] « less
  1. Univ. of Utah, Salt Lake City, UT (United States)
  2. Univ. Paris Diderot-Paris, Paris (France)
  3. Univ. Pierre et Marie Curie Paris 6, Univ. Denis Diderot Paris 7, Paris Cedex (France)
  4. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  5. Aix-Marseille Univ., CNRS LAM (Lab. d'Astrophysique de Marseille), Marseille (France)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. College London, London (United Kingdom)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. Ecole Polytechnique Federale de Lausanne, Lausanne (Switzlerland)
  9. Univ. of California, Irvine, CA (United States)
  10. Brookhaven National Lab. (BNL), Upton, NY (United States)
  11. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  12. Institucio Catalana de Recerca i Estudis Avancats, Barcelona (Spain); Univ. de Barcelona (UB-IEEC) (Catalonia)
  13. Univ. Paris 6 et CNRS, Paris (France)
  14. Univ. of Edinburgh, Edinburgh (United Kingdom)
  15. The Pennsylvania State Univ., University Park, PA (United States)
  16. The Ohio State Univ., Columbus, OH (United States)
  17. Univ. Paris-Saclay, Gif-sur-Yvette (France); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations

Here, we use flux-transmission correlations in Lyα forests to measure the imprint of baryon acoustic oscillations (BAO). The study uses spectra of 157,783 quasars in the redshift range 2.1 ≤ z ≤ 3.5 from the Sloan Digital Sky Survey (SDSS) Data Release 12 (DR12). Besides the statistical improvements on our previous studies using SDSS DR9 and DR11, we have implemented numerous improvements in the analysis procedure, allowing us to construct a physical model of the correlation function and to investigate potential systematic errors in the determination of the BAO peak position. The Hubble distance, DH = c/H(z), relative to the sound horizon is DH(z = 2.33)/rd = 9.07 ± 0.31. The best-determined combination of comoving angular-diameter distance, DM, and the Hubble distance is found to be D0.7HD0.3M/rd = 13.94 ± 0.35. This value is 1.028 ± 0.026 times the prediction of the flat- ΛCDM model consistent with the cosmic microwave background (CMB) anisotropy spectrum. The errors include marginalization over the effects of unidentified high-density absorption systems and fluctuations in ultraviolet ionizing radiation. Independently of the CMB measurements, the combination of our results and other BAO observations determine the open-ΛCDM density parameters to be ΩM = 0.296 ± 0.029, ΩΛ = 0.699 ± 0.100 and Ωk = –0.002 ± 0.119.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
SC00112704
OSTI ID:
1351746
Report Number(s):
BNL-113763-2017-JA
Journal Information:
Astronomy and Astrophysics, Vol. 603; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
cosmology
Lyα forest
large scale structure
dark energy